Spark-plug tester.



W. D. LUCE.`

SPARK PLUG TESTER. u APPLICATION man 1AN.3|. |911.

' Patnd Dec. 4,1917.

wilful -Speci'cation of Letters Tete nt.

" synnxme TESTER. l

Patented Ime.

Appication med January 31.1917. Serial No. Me.

To all 'whom z't may concern.' Be it known that I, WILLIAM D. LUCE,citizen of` the *United States, and a. resident of Haverhill, county ofEssex and State of Massnchusetts, have invented an Improve ment inSpark-Plug Testers, o'`1 4which the folll'i'wing 1s :L specification.

This invention relates to devices for testing theI spark-plugs ofinternal-Combustien. engines, to determine if the 'plu me sperli-`ingproperly, said devices being eoinmoniy known as jump-spark testers.These de vices haveueuelly comprised. n. handle henring a pair VO'fContact arms7 one being adept ved to he grounded on the engine und theothell to be held in Contact with. the ping which is being tested, saidarm being .leeK trically Connected to' eperlpponts which are held inproximity, but eut of Contact in .a ichan'lherformed in the handle andse itl-ranged that thespm-k may he ohseived The conditions, under whichdevi this character ere lil'lely'to be used, vary,

'considereblyq so that, while such u. device muy be convenientlylemployed under seme eondi'tiens, it eannot be .'on've'niently einployedunder' others, and, es f1- vesult, their lack of adaptability .isSolnei-imes en jeetion. l

.The primary Object ef my inve V provide a devine of the Character nfexfied to, which 'is .irendily edel. ferent Conditions of use end wir`zutaipted to be .reduced in einev may be conveniently carried inthepoeket.

I accomplish ths'and other @biente ef my invention,- by the menne shawnin the eeeompanying drawing ,in Whi'h.:-'-

Figure 1 is a top View of e, jumpsperh testei embed ing my invention.

1 Figs. 2am 3 are views of oppneite side:

thereof. y i

'Figs/J; 4and 'areseotionel views en an enlar ed ,scale 4tekenrespectively etlline P415 an 5. -5 o 'Fig 2. ,-2V

`Figs.. 6 a ld 7 are elevations showing the device inv dierentpositions;l of use.

As,shown i' n the .di'ztwing the device eemrises e han le a2 of wood orother suitable atenei; 11i-Which a. recess or.

msulating chunibien wffis formed adjacent. oneend .opens to Athe topsdethe'reef, sind reeess heving e concavejmmroij E51 secured v .bottomand ,having e preferabl convex l 55. glass cover c. so arranged that thelight trom cated in (if lff Y `the hendle t true ef the ehe;

on its.'

the spat-ke'. which may he formed Ain the elntml'ier.' will heieflee'ted by the minion ente the glass and the nppemnnce therenf thushe tin...ensifie1i`i.

A pail' of attaching platee e und y nre em'ed 11n the opposite elds thehandle dijeetly op the rece und e pele of contant em j and are pim-nn.sy i'nonnted the'een, a iee'tive'y, hy menne el. temlar ri erts i, j.Im'rgiged in nel e inmwnig. with eneh other, that seid au". he swungtlxevfffm between directly itildinni pesitinns. in en@ et e-*h beyondthe end et the hmnlhl y with and in the etl'e'.' of .vl'llch they' lieelengfde the hnndle. es r-.spec'tive-lf indi- !:he dotted and full lineDesitions of Fig. l. The pivetnl l :airing of seid Mins is medesnieientiy tig it te held seid Mms fiietienally., in any position tewhich thev may be adjusted. and. preferably, small 'proun jeetions gfand ft are fran d en the innen .ride et' sind :mns man con spendingindentntous mefnfined in the enter' eide-of said ple-tes e, te previdesemi-'f tinnstl loeks fer Suid :Mins in he two hengitud nel and twi) fuegms-Rions te vvheh they ne of .fide

may i the aims.. y, is nl much len 'tl-fm the n, ees en peil seyews; myfn., me eleetrienlly eminent 2, spetively and extendinto the reeess nimn enieiently pnxnaity 5:0 previde e. spark p, or to pei-init :sparitete pees timmbetWe-en With es. in Fi 6 eeeenhn conditions 7 a .s a

e eenvenient eigifft'sn'einent ermeny 'Gendt i tions being to have e eerin adjusted to the longitudinal poeit'oi'i :sind the other te theright engelen pesitien; es` nflig. TF sethet passing between the thelight will be I reflected by the concave mirror b, onto the lass c,considerably intensified, so that the act as to whether the electricalconnections between the plug, and the source of electrical supply, arein good condition, may be readily determined.

I claim 1. A jumpsspark tester comprising an' in sulating handlehavingan inspection chan ber therein, adjacent one end, a pair ofconductors extending into 'said chamber from opposite sides of thehandle with their adjacent ends `in sparking relation, a pair of contactarnisp'livotally mounted at oppol sitesides of the andle to swing aboutsaid conductors, respectivel'between folded po,

e the handle and positions of siti'ons' alngsi also be use at differentangles thereto and longitudinally thereof.

2.' A'jump-spark tester comprising an insulating handle having aninspection chamber therein adjacent one end, attaching plates secured tothe handle atopposite sides of said chamber, a pair of contact armshaving tubular pivots connecting the same to said attaching platesrespectively, to permit said arms to be swun longitudinal and a pair ofconductor screws threaded in said pivots and extending into sparkingrelation with each other Within said chamber.

3. A'jump-spark tester comprising an insulating handle having aninspection ber therein adjacent one end, aA pair of contact arms havinga frictional pivotal connection with the handle at o posite sides ofsaid chamber, to permit saidD arms to be chambetween opposite positionsre ative to the handle,

swung between directly opposite positions longitudinally of the handleand to be held friotionally in Said positions and indiierentintermediate positions, and a pair of conductors having electricalconnection with said arms, respectively, and extending into said chamberin sparking relation.

In testimony whereof, I have signed my name to this specification.

` Y WILLIAM D. LUCE. Witness:

L. H. HARRIMAN.

